The difference is plating on the contact area.
QR/P1-PC2A-211(12) : Nickel+gold Min. 0.2μm
QR/P1-PC2A-211(15) : Nickel+palladium nickel+gold Min. 0.2μm (scheduled to be discontinued)
QR/P1-PC2A-211(12) : Nickel+gold Min. 0.2μm
QR/P1-PC2A-211(15) : Nickel+palladium nickel+gold Min. 0.2μm (scheduled to be discontinued)
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